Inbreeding depression on growth and prolificacy traits in two lines of rabbit
Visualitza/Obre
Data de publicació
2022-10-26ISSN
0931-2668
Resum
Inbreeding depression in closed populations impairs animal fitness, health, and productivity. However, not all inbreeding is expected to be equally damaging. Recent inbreeding is thought to be more harmful than ancient inbreeding because selection decreases the frequency of unfavourable alleles with time. Accordingly, selection efficiency is improved by inbreeding in a process called purging. This research aimed to quantify inbreeding depression on growth and prolificacy traits in two lines of rabbits selected for just one growth (Caldes line) or prolificacy (Prat line) trait, and also to find some evidence of purging of deleterious alleles by selection. Caldes line comprised 51 generations and 124,371 animals in the pedigree. Prat line comprised 34 generations and 161,039 animals in the pedigree. The effects of old, intermediate, and new inbreeding (Fold, Fint, and Fnew), as well as total cumulated classical inbreeding (F) and 3 measurements of ancestral inbreeding (AHC, Fa.K, and Fa.B) were estimated for average daily gain (ADG), slaughter weight (SW), weaning weight (WW), born alive (BA), the total number of kits (NT), and the number of weaned kits (NW). There was a clear inbreeding depression for all growth and prolificacy traits in the Caldes line (−7.19 g/d, −0.45 kg, −0.25 kg, −6 kits, −4 kits, and −4 kits per unit of increase in F for ADG, SW, WW, BA, NT, and NW, respectively) and also in Prat line (−7.48 g/d, −0.31 kg, −0.11 kg, −4 kits, −5 kits, and −4 kits per unit of increase in F for ADG, SW, WW, BA, NT, and NW, respectively). The inbreeding partition appears to be a reliable alternative for assessing inbreeding depression and purging. Thus, for example, in the Caldes line and for ADG the regression coefficients were −7.61, −5.41, and 7.76 g/d per unit of increase in Fnew, Fint, and Fold, respectively. In addition, AHC and Fa.B may provide more accurate evidence of purging than Fa.K. This study confirms the existence of inbreeding depression for growth and prolificacy traits in both lines of rabbits and shows evidence of purging of deleterious recessive alleles involved both in growth and prolificacy, independently of the selection criteria established in the line.
Tipus de document
Article
Versió del document
Versió acceptada
Llengua
English
Matèries (CDU)
636 - Explotació i cria d'animals. Cria del bestiar i d'animals domèstics
Pàgines
31
Publicat per
Wiley
Publicat a
Journal of Animal Breeding and Genetics
Citació
Piles, M., Sánchez, J. P., Pascual, M., & Rodríguez‑Ramilo, S. T. 2022. "Inbreeding depression on growth and prolificacy traits in two lines of rabbit". Journal of Animal Breeding and Genetics, 00, 1–10. doi. org/10.1111/jbg.12745.
Número de l'acord de la subvenció
EC/H2020/633531/EU/Adapting the feed, the animal and the feeding techniques to improve the efficiency and sustainability of monogastric livestock production systems/Feed-a-Gene
MICIU/Programa Estatal de I+D+I orientada a los retos de la sociedad/RTI2018-097610-R-I00/ES/MEJORA DE LA EFECTIVIDAD Y LA VIABILIDAD DE LOS PROGRAMAS DE SELECCION GENETICA PARA AUMENTAR LA EFICIENCIA ALIMENTARIA DE ESPECIES PROLIFICA/
Programa
Genètica i Millora Animal
Aquest element apareix en la col·lecció o col·leccions següent(s)
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Drets
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